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Grow at Home: growing Sunflowers in pots or the garden

Written by Sarah Talbot

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Posted on 5 April 2020

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Wouldn't it be lovely if the result of this unwelcome super virus was that every garden, allotment and balcony became home to a host of sunflowers?

The bees and other insects would be overjoyed. The birds would have a feast to see them through winter. And parents would have a source of inspiration for homeschooling sorted - more of that later. If you don't have a garden, don't worry. Sunflowers can be grown in pots if you have a nice bright and sunny space to put them in.

What sort of Sunflowers to Grow

Sunflowers can be single stem or branching. It will say on the packet which sort they are so choose carefully depending on what you want to achieve.

Single-stem

These only grow one flower from one seed - so probably the sort you want if you are going for "Tallest Sunflower" Because they only have one flower you will need to plant seeds every 7 to 10 days to keep flowers in your garden all summer.

Branching sunflowers

These produce many flowers over the season. And these generally have the less traditional colours like oranges and chocolate tones.

How to grow Sunflowers

Whichever sort you choose, you can sow them either in pots or straight into the ground where they are going to flower.

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Sowing in the Ground

If you are sowing sunflowers into the ground then make sure the area is weed free. Once you have pulled up all of the weeds rake the soil and make some drills (shallow trenches) 1/2" (12mm) deep.

Carefully place 2 seeds an inch (5cm) or so apart into the drill every 17" (45cm) or so. Cover the seeds with soil. Water gently. Keep watering daily if there isn't rain and your seeds should take 7 to 10 days to appear. Some seeds will grow stronger than others. So take out the weaker of the two seedlings and either discard or plant elsewhere.

Growing in a pot

The pots you choose can be anywhere between 12" like the Vigoroot 20L pot to 14" like the Potato/ tomato Planter or for even better root growth try the Vigoroot Potato/ Tomato Planter.

Make sure whatever you use has good drainage holes or the seeds will rot. Fill your pot with compost. Plant 2 seeds near the middle of the pot, pushing them into the soil about 1" (2.5 cm). Add a thin layer of compost over the seed and water gently. Continue to water daily and your seeds should appear in 7 to 10 days. Once they do, take out the weakest one and either discard or transplant elsewhere.

Watering Sunflowers

For Both Pot and Ground grown - Sunflowers need to be watered well or they will become spindly. So water every day to ensure that your sunflower never gets dry. Slugs and snails adore young sunflower plants so they need protection.

For sunflowers in pots a line of copper tape round the pot may help to deter invaders. A beer trap is ideal for dealing with slugs and snails. You could also use a Victorian Bell cloche to protect the seedlings. If you can't get hold of those then cutting the top off a plastic bottle and placing it over your seedlings will work too. As your sunflower begins to grow you will need to support the stem. Place a bamboo cane next to the stem and secure it with Soft tie. This will ensure that the stem is not damaged as it blows about.

Feeding Sunflowers

Sunflowers don't necessarily need feeding to grow but they will take everything there is from your soil so it may be worth feeding them. Its maybe more important for those in pots. If you decide to feed then before they flower, use a high-nitrogen liquid plant food, then move to one with more phosphorus when they begin to flower. Watch your monster sunflower grow and grow and grow. If you are lucky it will grow bigger than the biggest ever sunflower. That was recorded at 30 feet (9.17m.) That's about twice the height of a giraffe and taller than the length of a London bus!

What to Grow next

Once you have mastered the sunflower then how about growing its close relative: the Jerusalem Artichoke? You get very similar flowers plus veg that comes back year after year.  So, if you have the room then take a look at this blog and give them a go.  Grow at Home; Jerusalem Artichokes.  

Home Schooling Ideas

Hopefully no-one is being forced to home-school anymore.  But, I said I would come back to this so for those of you who choose to home school these are the boxes you can tick with a simple sunflower.

Science

Gardening is science so that box is ticked right away. For older children read about photosynthesis and how this works, measure the pH of the soil (if you happen to have a kit at home.) For younger children name the parts of the plant - stem, petals etc.

Maths

Estimate the height of the flower then measure each week, if you are growing more than one make little tags and use them to order the flowers from tallest to smallest

English

Write instructions for someone to grow their own, write a story or poem about a sunflower,

Art

Draw your sunflower, paint pictures of them (someone once got very famous doing that!) Make a sunflower out of the junk in your recycling box. Even knit a sunflower if you know how... Top Tip: Seeds can be bought online or many Garden Centres are still delivering. Give your local one a call to see how they are doing things.

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